Cleanup configurable getter usages

You don't have to call module.ConfigurableEvaluator(ctx) if ctx is
already a ModuleContext, you only need to do that for more restricted
contexts like SingletonContext.

Bug: 323382414
Test: m nothing --no-skip-soong-tests
Change-Id: I7612290d43dae7decfae283a341882d9016c98a3